Knowledge Base

XFOR: Comments in SMTP Addresses Cause NDR when Replying

Article ID: 152432

Article Last Modified on 10/28/2006

APPLIES TO

This article was previously published under Q152432

SUMMARY

When you receive an Internet message in a Microsoft Exchange client that has multiple comments on the Address line, an attempt to reply to this message will result in a Non-Delivery Receipt (NDR).

MORE INFORMATION

RFC 822 allows parenthesis, enclosed comments, to be placed anywhere in the message header. If a message with multiple comments on the address line is sent from the Internet to a Microsoft Exchange client, only the first comment is stripped out. When you reply to this message, Microsoft Exchange will attempt to resolve the remainder of the address (including the comment) as a valid address.

STATUS

Microsoft has confirmed this to be a problem in version 4.0 of Microsoft Exchange. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

Additional query words: IMC comment header RFC

Keywords: kbusage KB152432


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